Vibrating device for screeding machine

ABSTRACT

A vibrating device for a screed head assembly mountable to a screeding device includes a vibrating member and a vibrating system. The vibrating member comprises an integrally formed elongated member having upper and lower screeding surfaces and a vertical portion extending therebetween. The vertical portion may define a hollow cavity therealong. The vibrating system is operable to vibrate the vibrating member to compact and smooth the concrete surface. The vibrating system is mounted to the vertical portion of the vibrating member and operates to vibrate the vibrating member to screed the concrete surface when the lower screeding surface engages the concrete surface. The vibrating system may include a drive motor operable to rotatably drive at least one drive pulley which, in turn, drives a drive belt to rotate at least one eccentric element rotatably mounted to the vibrating member.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of U.S. provisionalapplication Ser. No. 60/738,091, filed Nov. 18, 2005, which is herebyincorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates generally to screeding devices forscreeding and finishing a surface of loose and/or plastic material suchas of uncured concrete, sand, dirt, combinations thereof or the likeand, more particularly, to a screeding device having a screed headassembly which includes a vibrating device.

BACKGROUND OF THE INVENTION

It is known to provide a screed head assembly which includes a plow,auger and vibrating device and which is operable to establish a gradeand substantially compact, smooth and/or finish the surface of loose,plastic material such as uncured concrete. The vibrating devicetypically includes a generally horizontal beam for engaging the concretesurface, and a generally horizontal shaft extending along the beam. Theshaft includes eccentric weights or discs spaced therealong. Rotationaldriving of the shaft thus imparts rotation of the eccentric weightswhich, in turn, causes the beam to vibrate to compact and screed theconcrete surface as the screed head assembly is moved over and along theconcrete surface.

Typically, the eccentric weights are rotated in response to a drivemotor that rotatably drives a horizontal drive shaft that is mountedalong the vibrating member. The horizontal drive shaft or shafts is/arerotatably driven by the drive motor and function to rotatably drive theeccentric weights. Such horizontal drive shafts are supported andmounted along the vibrating member via a plurality of bearings andmounts to rotatably support the shaft or shafts at multiple locationsalong the vibrating members.

SUMMARY OF THE INVENTION

The present invention is intended to provide a screed head assembly fora screeding device or machine which includes a plow, an auger and avibrating device. The vibrating device includes a drive motor and drivesystem that operate to rotate a pair of eccentric discs at or toward ornear each end of a vibrating member, so as to vibrate the vibratingmember to compact and smooth the concrete surface. The drive systemincludes drive pulleys and drive belts that operate to rotate theeccentric discs in response to rotational driving by the drive motor.

According to an aspect of the present invention, a vibrating device fora screed head assembly mountable to a screeding device includes avibrating member and a vibrating system. The vibrating member comprisesa unitary or integrally formed elongated member having upper and lowerscreeding surfaces and a vertical portion extending therebetween. Thevertical portion defines a hollow cavity therealong. The vibratingsystem is mounted to the vertical portion of the vibrating member andoperates to vibrate the vibrating member to screed the concrete surfacewhen the lower screeding surface engages the concrete surface.

The vibrating member may comprise an extruded vibrating member, such asextruded of aluminum or other suitable material. The upper and lowerscreeding surfaces may be formed to be substantially similar so that thevibrating member may be flipped over to use the initially upperscreeding surface to engage the concrete surface. Optionally, the hollowcavity may be filled with an insulating element.

According to another aspect of the present invention, a vibrating devicefor a screed head assembly mountable to a screeding device includes avibrating member and a vibrating system. The vibrating member includes agenerally planar lower surface for engaging a surface of uncuredconcrete, dirt, sand, gravel or the like, and a generally verticalportion extending upwardly from the lower surface. The generallyvertical portion extends longitudinally along the vibrating member. Thevibrating system is operable to vibrate the vibrating member to compactand smooth the concrete surface. The vibrating system includes a drivemotor operable to rotatably drive at least one drive pulley which, inturn, drives a drive band or belt to rotate at least one eccentricelement rotatably mounted to the vibrating member. Rotation of theeccentric element or elements imparts a vibration to the vibratingmember.

Optionally, the eccentric element comprises a pair of eccentric elementsspaced along the vibrating member. Optionally, the eccentric elementcomprises a pair of eccentric discs mounted at a rotatable shaft. One ofthe eccentric discs may be fixedly mounted to the shaft and the other ofthe eccentric discs may be adjustably positioned about the shaftrelative to the first eccentric disc. The eccentric discs may beselectively oriented to selectively set a degree of vibration of thevibrating element.

Therefore, the present invention provides a vibrating device for ascreed head assembly that includes an extruded vibrating member and apulley and belt drive system. The extruded vibrating member may providea low cost vibrating member that may be flipped or reversed to providean increased life cycle of the vibrating member as one surface or edgebecomes worn. The extruded vibrating member may include a hollow cavitytherealong, and the cavity may be substantially filled with aninsulating material or element to reduce noise during operation of thevibrating device. The drive system provides rotational driving ofeccentric elements to vibrate the vibrating member, while providing amounting arrangement that has reduced bearings and mounts as compared toknown horizontal shaft vibrating systems.

These and other objects, purposes, advantages and features of thepresent invention will become apparent upon review of the followingspecification in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a screed device or machine having ascreed head assembly and vibrating device in accordance with the presentinvention;

FIG. 2 is a perspective view of the vibrating device suitable for usewith the screed head assembly of FIG. 1;

FIG. 3 is another perspective view of the vibrating device of FIG. 2;

FIG. 4 is another perspective view of the vibrating device of FIGS. 2and 3, taken generally at an end of the vibrating device;

FIG. 5 is another perspective view of the vibrating device of FIGS. 2-4,taken generally at the same end as in FIG. 4;

FIG. 6 is an end elevation of a portion of the vibrating device of thepresent invention, showing the drive belts and pulleys of the drivesystem of the present invention;

FIG. 7 is an enlarged perspective view of the drive system of thevibrating device of FIG. 3;

FIG. 8 is an enlarged end elevation of the drive system shown in FIG. 6;and

FIG. 9 is an end elevation of the eccentric discs suitable for use withthe vibrating device of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings and the illustrative embodiments depictedtherein, a screeding device or machine 10 includes a wheeled base unit12 and an extendable or telescoping boom assembly 14 which extends frombase unit 12 (FIG. 1). A screed head assembly 16 is adjustably mountedat an outer end 14 a of extendable boom 14, as discussed below. Wheeledbase unit 12 is movable via wheels 26, preferably having pneumatic tires28 formed from rubber or other materials thereon, and is positionableadjacent to an area of uncured concrete (or other material) to beprocessed, worked, compacted, vibrated, smoothed and/or screeded byscreed head assembly 16. In the illustrated embodiment, screed headassembly 16 includes an auger device or assembly 18, a plow 20positioned forwardly of auger device 18, and a vibrating device 22positioned rearwardly of auger device 18. Plow 20 and auger device 18function to establish the grade of the uncured concrete surface, whilevibrating device 22 compacts and smoothes the uncured concrete surfaceas screed head assembly 16 is moved over the uncured concrete surface,as discussed below. Although described as being suitable for processingan uncured concrete surface, the present invention is equally suitablefor processing surfaces of other materials, such as sand, dirt, gravelor the like, without affecting the scope of the present invention.

Wheeled base unit 12 includes a lower support frame 24 having front andrear propulsion support axles, each of which may provide both propulsionand steering capability of the tired wheels 26, 28. An upper frame 30 ofbase unit 12 may be rotatable relative to lower frame 24 and may includean operator support platform or control platform 32. Wheels 26 may beindividually driven or powered by hydraulic motors (not shown) or othermeans for independently driving the wheels of base unit 12, withoutaffecting the scope of the present invention. Wheeled base unit 12 andboom assembly 14 of screeding device 10 may utilize principles disclosedin U.S. Pat. Nos. 4,930,935; 6,183,160; 6,152,647; and/or 6,129,481,which are hereby incorporated herein by reference.

The concrete screeding machine may comprise any type of concretescreeding device or machine, such as a LASER SCREED™ screeding machineas commercially available from Somero Enterprises, Inc. of Houghton,Mich., or other types of suitable concrete screeding devices ormachines, without affecting the scope of the present invention. Forexample, the screeding machine may comprise a screeding machine of thetypes disclosed in U.S. Pat. Nos. 4,655,633; 4,930,935; and 6,227,761,which are hereby incorporated herein by reference. In the illustratedembodiment, the extendable and retractable boom 14 extends and retractsrelative to the wheeled base unit 12, and is extendable and retractableto move screed head assembly 16 over and along a targeted concretesurface, while the screed head assembly 16 is vertically adjustablerelative to the boom 14.

The screed head assembly 16 may be adjustably positioned such that theauger 18 is at a desired grade via a pair of actuators or hydrauliccylinders 34, one at or near each end of the screed head assembly. Theactuators 34 may be operable to raise and lower the screed head assemblyin response to an automatic elevation control system, such as a controlsystem utilizing laser beacon receivers 36 and a laser reference planegenerator (not shown), which is typically mounted externally ofscreeding machine 10 on a tripod or another fixed location. Theelevation of the plow, vibrating assembly and auger assembly may thus beadjustable relative to a cross member support in response to the laserplane system, such as by utilizing aspects of the screeding devicesdescribed in U.S. Pat. Nos. 4,655,633; 4,930,935; and 6,227,761, whichare hereby incorporated herein by reference. Optionally, the laserreceivers may be replaced with at least one three dimensional trackingtarget (not shown) and one sonic height sensor (not shown) for use withan automatic three dimensional profiler system commercially availablefrom Somero Enterprises of Houghton, Mich., and such as disclosed inU.S. Pat. No. 6,227,761, issued May 8, 2001 to Kieranen et al. forAPPARATUS AND METHOD FOR THREE DIMENSIONAL CONTOURING, which is herebyincorporated herein by reference.

Screed head assembly 16 includes vibrating device 22 positionedrearwardly of auger device 18 and plow 20. As shown in FIGS. 2-5,vibrating device 22 includes an elongated, generally I-shaped vibratingbeam or member 38, which includes a generally flat or planar base orlower portion or screeding surface 38 a, a similarly formed, generallyflat upper portion or screeding surface 38 b and a generally verticalportion or web 38 c extending therebetween. Lower portion 38 a mayinclude an upwardly turned front or leading lip 38 d along a forward orleading edge thereof to limit or substantially preclude vibrating member38 from cutting into the uncured concrete surface as screed headassembly 16 is moved over the uncured concrete surface.

In the illustrated embodiment, the lower and upper portions 38 a, 38 bof vibrating member 38 are substantially similar so that the vibratingmember 38 is formed to be reversible. Thus, if the vibrating member wereto be flipped 180 degrees about its longitudinal axis, the vibratingmember could be used with the initially upper portion 38 b engaging theconcrete surface (and with a curved lip 38 e at its forward or leadingedge when so positioned). Such a formation allows the vibrating memberto be flipped to use the other side or portion, such as in situationswhere the lower portion 38 a becomes worn, and thus may extend the lifecycle of the vibrating member.

As best shown in FIGS. 4 and 5, vibrating member 38 comprises agenerally hollow member with a central cavity along the member andbetween the generally vertical and spaced apart walls 39 a, 39 b of thevertical portion 38 c. Preferably, the vibrating member comprises anintegral member or unitary member, which is unitarily formed via aforming process. For example, the vibrating member may be extruded toform the hollow elongated member with the upper and lower portions beingsubstantially similar to one another and reversed relative to oneanother. The material selected for the extruded vibrating member maycomprise any suitable material, such as aluminum or the like, withoutaffecting the scope of the present invention.

As shown in FIGS. 2-5, vibrating device 22 includes a pair of rubberisolators or mounts 40, with a mounting element 40 a protrudingtherefrom, for attaching or mounting the vibrating device to the screedhead assembly. As best shown in FIGS. 4 and 5, isolators 40 and mountingelement 40 a (such as a threaded stud or the like) may be secured to amounting or attaching plate 42, which may be secured between thevertical walls 39 a, 39 b via spacer elements 42 a (such assubstantially rigid aluminum spacers or the like) and associatedfasteners or the like. The rubber isolator may protrude from the plate42 and through an opening or aperture 44 in one of the vertical walls 39a for engagement with the screed head assembly. As can be seen in FIGS.4 and 5, the vibrating member 38 may be formed with the apertures 44through both of the vertical walls 39 a, 39 b, so that the isolators mayprotrude through either aperture depending on the orientation ordirection of the vibrating member 38.

Vibrating device 22 also includes a pair of spaced apart vibratormounting brackets or arms or members 46, which are adjustably secured tothe screed head assembly, such as to an auger support beam or the likeand toward opposite ends thereof. The vibrator mounting arms 46 may bepivotally mounted at the upper portion 38 b of vibrating member 38, andmay be pivotally mounted at the screed head assembly. Vibrating member38 may include a pair of brackets 48 attached to upper portion 38 b. Thevibrator mounting arms 46 may be mounted to the respective brackets 48,such as generally L-shaped brackets as shown in FIGS. 2 and 3, viarubber vibration isolators or mounts 46 a to minimize vibration from thevibrating member 38 back to mounting arms 46 and the auger support beamand screed head assembly. Likewise, the mounting arms 46 may be mountedto the auger support beam via rubber vibration isolators or mounts 46 bto reduce vibration at the screed head assembly during operation of thevibrating device. In the illustrated embodiment, the mounting arms 46are adjustable elements, such as threaded turnbuckles or the like, sothat the arms may be adjusted in length to adjust the angle ororientation of the vibrating member 38 relative to the screed headassembly to set a desired pitch or attack angle of the vibrating member.

Vibrating device 22 includes a vibrating system or drive system 50,which is operable to vibrate the vibrating member 38 to compact andsmooth and screed the concrete surface when the vibrating member engagesthe concrete surface and while the screed head assembly is moved alongthe concrete surface. Drive system 50 includes a rotational drivingmotor 52, such as a hydraulic motor or the like, and a drive assembly54, which functions to rotate a pair of eccentric elements 56 inresponse to rotational driving by the drive motor 52, as discussedbelow. As shown in FIGS. 2 and 4, drive motor 52 is mounted to verticalwall 39 b (the rearward or trailing wall when in use) of vibratingmember 38. Drive motor 52 includes a drive shaft that extends from themotor and through the vertical portion 38 c of vibrating member tocouple with or connect to a drive pulley 54 a of drive assembly 54,which is attached or mounted at the other vertical wall 39 a (theforward or leading wall when in use) of vibrating member 38.

Drive assembly 54 includes drive pulley 54 a, a pair of idler pulleys 54b, 54 c and a guide or tensioning idler pulley 54 d rotatably mounted ata generally central location along vertical wall 39 a of vibratingmember 38. As best shown in FIGS. 5-8, a drive belt 58 is reeved aroundthe drive pulleys 54 a, 54 b, 54 c, 54 d and around wheels or pulleys 60that are coupled with the respective eccentric weights or discs orelements 56 at or near the opposite end or outer regions of thevibrating member. The belt may comprise any type of drive belt or chainor the like, and may include teeth or ridges along a surface thereof forenhanced gripping and engagement with the pulleys, while remainingwithin the spirit and scope of the present invention. Thus, rotationaldriving of drive pulley 54 a via operation of drive motor 52 functionsto drive the belt 58 around the pulleys 54 b, 54 c, 54 d and 60 torotate the eccentric elements 56 about their generally horizontal axesso as to impart a vibration to the vibrating member 38.

As best seen in FIGS. 6-8, drive pulley 54 a and idler pulleys 54 b and54 d are rotatably mounted to a mounting bracket 62 that is attached tovertical wall 39 a of vibrating member 38. The bracket 62 thus may bereadily attached to the vertical wall 39 a (such as via suitablefasteners or the like) and the pulleys may be mounted at the bracket,thereby easing the assembly process of the pulleys to the vibratingmember. The drive pulley 54 a and idler pulleys 54 b, 54 d thus may besubstantially fixed relative to one another by their respective mountingto the mounting bracket 62, which, in turn, is fixedly attached tovibrating member 38. As can be seen in FIGS. 6-8, however, idler pulley54 c may be adjustably mounted to vibrating member 38 to allow foradjustment of the tension in the drive belt 58.

In the illustrated embodiment, idler pulley 54 c is rotatably mounted toa mounting bracket 64, which is pivotably or adjustably mounted tovertical wall 39 a of vibrating member 38. The bracket 64 is pivotableabout one fastener 64 a, and includes an arcuate slot 64 b for slidablyor movably receiving another fastener 64 c therethrough, so as to allowfor pivotal movement of the bracket 64 when the fasteners are loosened asufficient amount. As can be seen in FIG. 8, pivotal movement of thebracket 64 about fastener 64 a in the counter-clockwise direction wouldincrease the tension in the belt 58, while pivotal movement aboutfastener 64 a in the opposite direction would decrease the tension inthe belt 58. When the bracket is positioned so that the pulley 54 cprovides the desired tension in the belt 58, the fasteners 64 a, 64 cmay be substantially tightened to substantially retain the bracket andpulley in the desired orientation. The fasteners may be tightened orsecured from the other side of the vibrating member, such as viaaccessing the fasteners through apertures 66 a (FIG. 2) in the wall 39 bof vibrating member 38, so that the bracket 64 (and thus the idlerpulley 54 c) may be secured relative to the vibrating member withouthaving to remove the idler pulley 54 c from the bracket 64. Similarly,the bracket 62 for the fixed pulleys may also be attached and securedvia fasteners that are accessible through apertures 66 b in wall 39 b ofvibrating member 38.

As shown in FIGS. 2, 4 and 9, eccentric elements 56 may be rotatablymounted to the vertical wall 39 b of vibrating member 38 andlongitudinally spaced from the center of the vibrating member.Desirably, and as shown in FIG. 2, the eccentric elements 56 may bepositioned generally at the mid-points between the drive motor 52 ordrive assembly 54 and the respective outer ends of the vibrating member38, in order to provide substantially uniform vibration along the entirelength of the vibrating member. In the illustrated embodiment, eacheccentric element 56 includes a pair of discs 68, 70, which are attachedto a rotatable shaft 60 a that rotates in response to rotation of therespective pulley 60. The shaft 60 a is attached to the discs 68, 70 ata location off-center or remote from the centers of the discs, such thatrotation of the shaft 60 a causes the discs to rotate about an eccentricaxis and thus to impart a vibration to the vibrating member.

Optionally, and as shown in FIG. 9, the discs 68, 70 may be adjustablerelative to one another to adjust the degree of vibration imparted bythe rotation of the discs 68, 70. For example, one of the discs, such asdisc 68 of the illustrated embodiment, may be fixedly attached to theshaft 60 a, while the other disc 70 may be rotatable around the shaftand relative to the disc 68 and securable relative to the disc 68 (andthus the shaft 60 a) when in the desired relative orientation. In theillustrated embodiment, one of the discs 68 includes a plurality ofopenings or apertures 68 a formed therethrough, while the other disc 70may include one or more similar apertures 70 a. A retaining pin 72 orfastener (such as a set screw or the like) may be inserted throughaperture 70 a in disc 70 and into a selected aperture 68 a in disc 68 toretain or secure the discs 68, 70 relative to one another in the desiredorientation. Thus, when the discs are oriented so that they aresubstantially oppositely positioned from one another (such as shown inFIG. 9), the degree of vibration imparted by rotation of the discs isreduced, since the off-center weight of disc 68 is partially orsubstantially canceled or balanced by the off-center weight of disc 70.If a greater degree of vibration is desired, the discs may be positionedor adjusted (such as by removing the pin 72 and rotating disc 70 aboutshaft 60 a) so that disc 70 is substantially aligned with disc 68,whereby the degree of vibration imparted by rotation of the discs isincreased due to the weight of both discs being at generally the sameside or region relative to the axis of rotation of the discs. Thus, thedegree of vibration of the vibrating member 38 may be adjusted to adesired level depending on the particular application of the vibratingdevice 22.

Therefore, the vibrating system or drive system 50 of the vibratingdevice 22 functions to rotate a pair of eccentric elements to impart thedesired degree of vibration to the vibrating member 38. The belt andpulley drive system provides an efficient system for rotatably drivingthe eccentric elements, without the need for multiple bearings and thelike typically required for horizontal shaft type vibrating systems. Thedrive system of the present invention thus may provide a system withreduced costs and enhanced assembly over known horizontal shaft systems.

Optionally, and desirably, an insulating material or element 74 may beinserted into the hollow cavity of the vibrating member 38, such as fromone of the open ends of the cavity, to substantially fill the cavity toreduce noise during operation of the vibrating device. The insulatingelement 74 may be inserted from one end (or two insulating elements maybe inserted from both ends) of the vibrating member, such as before theisolators 40 and plates 42 and the motor 52 and drive assembly 54 andpulleys 60 and eccentric elements 56 are attached to the vibratingmember. The insulating element may then be drilled through to form theapertures for receiving the appropriate fasteners and/or spacers and thelike. Optionally, the insulating element may be provided with theapertures already formed therethrough and with the appropriate spacersalready received in the apertures, so that the insulating element may beinserted into the end of the vibrating member and positioned so that theapertures and spacers substantially align with the holes in the verticalwalls 39 a, 39 b of the vibrating member 38.

The insulating element may comprise any suitable insulating material,such as a foam insulating material or the like, and may be substantiallyrigid to allow for insertion of the insulating element into the cavityand along the vibrating member. Optionally, the insulating element maybe a substantially fluid material or foam that is injected into thevibrating member and allowed to cure or substantially solidify withinthe cavity to insulate the cavity of the vibrating member, withoutaffecting the scope of the present invention. After the insulatingelement is inserted or otherwise established within the cavity (or atany time if no insulation is established within the cavity), a cap (notshown), such as a molded plastic or polymeric cap or the like, may beattached at each open end of the vibrating member to substantially sealthe ends of the vibrating member to limit or substantially precludeintrusion of debris and the like into the cavity of the vibratingmember.

Therefore, the present invention provides a vibrating device for ascreed head assembly that includes an extruded vibrating member and apulley and belt drive system. The extruded vibrating member may providea low cost vibrating member that may be flipped or reversed to providean increased life cycle of the vibrating member as one surface or edgebecomes worn. The extruded vibrating member may include a hollow cavitytherealong, and the cavity may be substantially filled with aninsulating material or element to reduce noise during operation of thevibrating device. The drive system provides rotational driving ofeccentric elements to vibrate the vibrating member, while providing amounting arrangement that has reduced bearings and mounts as compared toknown horizontal shaft vibrating systems.

Changes and modifications in the specifically described embodiments maybe carried out without departing from the principles of the presentinvention, which is intended to be limited only by the scope of theappended claims, as interpreted according to the principle of patentlaw.

1. A vibrating device for a screed head assembly mountable to ascreeding device comprising: a vibrating member, said vibrating membercomprising an integrally formed elongated member having upper and lowerscreeding surfaces and a vertical portion extending therebetween, saidvertical portion defining a hollow cavity therealong; and a vibratingsystem, said vibrating system being operable to vibrate said vibratingmember to compact and smooth the concrete surface, said vibrating systembeing mounted to said vertical portion of said vibrating member andoperating to vibrate said vibrating member to screed the concretesurface when the lower screeding surface engages the concrete surface.2. The vibrating device of claim 1, wherein said vibrating membercomprises an extruded vibrating member.
 3. The vibrating device of claim1, wherein said upper and lower screeding surfaces are formed to besubstantially similar so that the vibrating member can be flipped overto use the initially upper screeding surface to engage the concretesurface.
 4. The vibrating device of claim 1, wherein said hollow cavityis substantially filled with an insulating element.
 5. The vibratingdevice of claim 1, wherein said vibrating system comprises a drive motoroperable to rotatably drive at least one eccentric element rotatablymounted to said vertical portion of said vibrating member.
 6. Thevibrating device of claim 5, wherein said drive motor is operable torotatably drive at least one drive pulley which, in turn, drives a drivebelt to rotate said at least one eccentric element.
 7. The vibratingdevice of claim 5, wherein said at least one eccentric element comprisesa pair of eccentric elements spaced along said vibrating member.
 8. Thevibrating device of claim 5, wherein said eccentric element comprises apair of eccentric discs mounted at a rotatable shaft.
 9. The vibratingdevice of claim 8, wherein one of said eccentric discs is fixedlymounted to said shaft and the other of said eccentric discs isadjustably positioned about said shaft relative to said one of saideccentric discs.
 10. The vibrating device of claim 9, wherein saideccentric discs are selectively oriented to selectively set a degree ofvibration of said vibrating element.
 11. A vibrating device for a screedhead assembly mountable to a screeding device comprising: a vibratingmember, said vibrating member includes a generally planar lower surfacefor engaging a surface of uncured concrete, dirt, sand, gravel or thelike, and a generally vertical portion extending upwardly from saidlower surface, said generally vertical portion extending longitudinallyalong said vibrating member; and a vibrating system, said vibratingsystem being operable to vibrate said vibrating member to compact andsmooth the concrete surface, said vibrating system including a drivemotor operable to rotatably drive at least one drive pulley which, inturn, drives a drive belt to rotate at least one eccentric elementrotatably mounted to said vibrating member.
 12. The vibrating device ofclaim 11, wherein said at least one eccentric element comprises a pairof eccentric elements spaced along said vibrating member.
 13. Thevibrating device of claim 11, wherein said eccentric element comprises apair of eccentric discs mounted at a rotatable shaft.
 14. The vibratingdevice of claim 13, wherein one of said eccentric discs is fixedlymounted to said shaft and the other of said eccentric discs isadjustably positioned about said shaft relative to said one of saideccentric discs.
 15. The vibrating device of claim 14, wherein saideccentric discs are selectively oriented to selectively set a degree ofvibration of said vibrating element.
 16. The vibrating device of claim11, wherein said vibrating member comprises an integrally formedelongated member including an upper screeding surface at and along anupper portion of said vertical portion, said vertical portion defining ahollow cavity therealong and between said upper and lower screedingsurfaces.
 17. The vibrating device of claim 16, wherein said vibratingmember comprises an extruded vibrating member.
 18. The vibrating deviceof claim 16, wherein said upper and lower screeding surfaces are formedto be substantially similar so that the vibrating member can be flippedover to use the initially upper screeding surface to engage the concretesurface.
 19. The vibrating device of claim 16, wherein said hollowcavity is substantially filled with an insulating element.